The Bond Safety Indoor/Outdoor Glasses by Bouton Optical is a modernized version of a classic look that fits great for any application. The keyhole bridge and nylon frame provides a comfortable fit. The indoor/outdoor blue lens is a proprietary engineered lens that combines a slight yellow tint and a mirror coating. The light yellow tint blocks the harsh blue light emitted from electronic screens and the slight mirror coating on the outside reduces the glare from overhead lighting.